Eleven male and female healthy participants aged 45 years and over will be entered into this phase 1, single-centre, double-blind, randomised, cross-over study. The trial is designed to evaluate the bioavailability of OTS167, and the effects of food on pharmacokinetics (PK) of OTS167 when administered by the oral route. Correlative studies include evaluation of safety endpoints and examinations, and adverse events. This study involves 3 cohorts to evaluate the safety and tolerability of oral dosing from lower dose.